.site-header,
.site-footer,
.site-main {
    width: min(var(--container), calc(100% - 32px));
    width: min(
        var(--container),
        calc(
            100%
            - max(16px, env(safe-area-inset-left), env(safe-area-inset-right))
            - max(16px, env(safe-area-inset-left), env(safe-area-inset-right))
        )
    );
    margin-inline: auto;
}
.site-header {
    position: sticky;
    top: 12px;
    top: max(12px, env(safe-area-inset-top));
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 70px;
    margin-top: 12px;
    margin-top: max(12px, env(safe-area-inset-top));
    padding: 12px 14px;
    overflow: visible;
    isolation: isolate;
    background: var(--color-nav-surface);
    border: 1px solid var(--color-nav-border);
    border-radius: 24px;
    box-shadow: var(--shadow-nav);
    opacity: 1;
    transform: translate3d(0, 0, 0);
    transition:
        transform 420ms cubic-bezier(.4, 0, .2, 1),
        opacity 300ms ease,
        border-color 260ms ease,
        box-shadow 260ms ease;
}
.site-header::before {
    position: absolute;
    inset: 0;
    z-index: -1;
    border-radius: inherit;
    background: var(--gradient-nav-overlay);
    content: '';
    pointer-events: none;
}
.site-header::after {
    position: absolute;
    right: 12%;
    bottom: -1px;
    left: 12%;
    height: 1px;
    border-radius: 999px;
    background: var(--gradient-nav-accent-line);
    content: '';
    pointer-events: none;
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .site-header {
        background: var(--gradient-nav-surface);
        -webkit-backdrop-filter: blur(20px) saturate(145%);
        backdrop-filter: blur(20px) saturate(145%);
    }
}
.site-header.site-header--scrolled {
    border-color: var(--color-nav-border-scrolled);
    box-shadow: var(--shadow-nav-scrolled);
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .site-header.site-header--scrolled {
        background: var(--gradient-nav-surface-scrolled);
        -webkit-backdrop-filter: blur(22px) saturate(150%);
        backdrop-filter: blur(4px) saturate(50%);
    }
}
.site-header.site-header--hidden {
    opacity: .98;
    pointer-events: none;
    transform: translate3d(0, calc(-100% - 28px), 0);
    transform: translate3d(
        0,
        calc(-100% - max(28px, env(safe-area-inset-top))),
        0
    );
}
body.mobile-menu-open .site-header {
    opacity: 1;
    pointer-events: auto;
    transform: translate3d(0, 0, 0);
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 5px 8px 5px 5px;
    border: 1px solid transparent;
    border-radius: 15px;
    transition:
        color 180ms ease,
        border-color 180ms ease,
        background-color 180ms ease;
}
.brand:hover {
    border-color: var(--color-nav-link-border-hover);
    background: var(--color-surface-glass-hover);
}
.brand:focus-visible,
.desktop-nav a:focus-visible,
.mobile-menu a:focus-visible,
.site-header .language-switcher a:focus-visible,
.site-header .menu-toggle:focus-visible,
.site-header .btn:focus-visible {
    outline: 2px solid var(--color-focus-ring);
    outline-offset: 2px;
}
.site-header .language-switcher a:focus-visible {
    outline-offset: -2px;
}
.brand-mark { width: 34px; height: 34px; object-fit: contain; }
.brand-name {
    color: var(--color-accent-text-strong);
    letter-spacing: .08em;
    font-family: var(--font-display);
    font-size: 18px;
    white-space: nowrap;
    text-shadow: var(--shadow-brand-text);
}
.desktop-nav { display: none; gap: 22px; color: var(--color-text-secondary); font-size: 14px; }
.desktop-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding-inline: 10px;
    border: 1px solid transparent;
    border-radius: 14px;
    transition:
        color 180ms ease,
        border-color 180ms ease,
        background-color 180ms ease;
}
.desktop-nav a:hover {
    color: var(--color-accent-text-strong);
    border-color: var(--color-nav-link-border-hover);
    background: var(--color-surface-glass-hover);
}
.header-actions { display: flex; align-items: center; gap: 10px; }
.site-header .language-switcher,
.site-header .theme-toggle,
.site-header .menu-toggle,
.site-header .btn-outline {
    border-color: var(--color-border-control);
    background: var(--color-nav-control-surface);
    box-shadow: inset 0 1px 0 var(--color-nav-item-border);
}
.site-header .language-switcher {
    background: var(--color-nav-language-surface);
}
.site-header .language-switcher a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    min-height: 44px;
}
.site-header .btn-small {
    min-height: 44px;
}
.site-header .language-switcher a.active {
    box-shadow: var(--shadow-nav-control-active);
}
.site-header .menu-toggle:hover,
.site-header .theme-toggle:hover,
.site-header .btn-outline:hover {
    border-color: var(--color-border-control-hover);
    background: var(--color-control-surface-hover);
}
.header-logout-form {
    margin: 0;
}
.site-main { padding: 26px 0 70px; }
.section-pad { padding: 28px 0; }
.site-footer {
    display: grid;
    gap: 18px;
    padding: 28px 0 40px;
    border-top: 1px solid var(--color-line);
    color: var(--color-text-secondary);
}
.site-footer strong { color: var(--color-accent-text-strong); font-family: var(--font-display); letter-spacing: .08em; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 16px; }
.mobile-menu {
    position: fixed;
    top: 94px;
    top: calc(82px + max(12px, env(safe-area-inset-top)));
    left: 16px;
    right: 16px;
    left: max(16px, env(safe-area-inset-left));
    right: max(16px, env(safe-area-inset-right));
    z-index: 60;
    display: grid;
    gap: 8px;
    max-height: calc(100vh - 194px);
    max-height: calc(
        100dvh
        - 194px
        - env(safe-area-inset-top)
        - env(safe-area-inset-bottom)
    );
    padding: 16px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border: 1px solid var(--color-border-control);
    border-radius: 20px;
    background: var(--color-nav-surface-menu);
    box-shadow: var(--shadow-menu);
}
@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
    .mobile-menu {
        background: var(--gradient-menu-surface);
        -webkit-backdrop-filter: blur(20px) saturate(140%);
        backdrop-filter: blur(20px) saturate(140%);
    }
}
.mobile-menu[hidden] {
    display: none !important;
}

body.mobile-menu-open {
    overflow: hidden;
}
.mobile-menu a {
    padding: 14px;
    border: 1px solid var(--color-nav-item-border);
    border-radius: 14px;
    color: var(--color-text-secondary);
    background: var(--color-nav-item-surface);
    box-shadow: inset 0 1px 0 var(--color-nav-item-surface);
}
.mobile-menu a:hover {
    color: var(--color-accent-text-strong);
    border-color: var(--color-nav-active-border);
    background: var(--color-nav-active-surface);
}
.mobile-theme-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 10px 14px;
    border: 1px solid var(--color-nav-item-border);
    border-radius: 14px;
    background: var(--color-nav-item-surface);
}
.mobile-theme-row__label {
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 650;
}
.mobile-theme-row .theme-toggle {
    min-width: 152px;
}

@media (prefers-reduced-motion: reduce) {
    .site-header,
    .brand,
    .desktop-nav a {
        transition-duration: 1ms;
    }
}

@media (prefers-contrast: more) {
    .site-header,
    .mobile-menu {
        border-color: var(--color-nav-contrast-border);
        background: var(--color-nav-surface-contrast);
    }
}

@media (forced-colors: active) {
    .site-header,
    .mobile-menu,
    .mobile-menu a {
        border: 1px solid CanvasText;
    }

    .brand:focus-visible,
    .desktop-nav a:focus-visible,
    .mobile-menu a:focus-visible,
    .site-header .language-switcher a:focus-visible,
    .site-header .theme-toggle:focus-visible,
    .site-header .menu-toggle:focus-visible,
    .site-header .btn:focus-visible {
        outline-color: Highlight;
    }
}